CN101631092A - System and method for distributing data - Google Patents
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- CN101631092A CN101631092A CN200810137755A CN200810137755A CN101631092A CN 101631092 A CN101631092 A CN 101631092A CN 200810137755 A CN200810137755 A CN 200810137755A CN 200810137755 A CN200810137755 A CN 200810137755A CN 101631092 A CN101631092 A CN 101631092A
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Abstract
The invention relates to a system and a method for achieving quality-of-service guaranteed data distribution in a video-on-demand system based on a P2P technique, wherein by combining a P2P mode with a client-server mode, the system has better performance. In the system and the method, through the P2P mode, clients can provide services for each other so that the system has excellent expandability. When the P2P mode cannot provide satisfactory performances due to the unstability of the clients, the client-server mode is combined with the P2P mode to provide a quality-of-service guarantee for users.
Description
Technical field
The present invention relates to a kind of based on the method and apparatus of realizing the data distribution systems that service quality guarantees in the video on-demand system of P2P technology.
Background technology
The content distribution is one of guardian technique of IPTV system.Mainly contain two kinds of patterns at present, a kind of is traditional client-server pattern, and another kind is equity transmission (P2P) pattern.For the distribution of video on demand content in the IPTV system, traditional client-server pattern can run into the problem of extensibility.In order to realize that promptly putting is multicast function, server is whenever received a client's order request, all will set up a clean culture for it separately and connect.Therefore, this pattern requires server to have sufficient outlet bandwidth and sufficiently high performance, thereby makes that the cost of system is very expensive, is difficult to support a large amount of users simultaneously.
Compare with the client-server pattern, can provide better extensibility based on the pattern of P2P.In the P2P system, each client all is a peer node, and it both can also can utilize the content of oneself storing to provide service for other peer node simultaneously from server or other client requests service and received content.The service ability of whole system increases along with the growth of number of users like this, might support large-scale consumer, thereby has good expandability.Present client (such as set-top box) has bigger hard disk usually, can store a certain amount of video content.Under the P2P pattern, these contents can provide service for other user, thereby can alleviate bandwidth consumption and load of server on the backbone network.The P2P pattern both can be used for the application of live class, also can be used for the application of program request class.Different with live class application is that user's request is asynchronous in the program request class is used, and system need support some mutual control commands to program (as F.F., rewind down and time-out etc.).The researcher has proposed much the solution based on the video on-demand system of P2P.In document [1], defined basic procedure based on P2P pattern VOD, comprising how client inquires about can be for it provides the peer node of service and obtains data from this peer node, has also discussed simultaneously some " backing " content is deployed to client in advance gets on to improve the service ability of P2P system.Document [2] has mainly been considered the content rights problem in the P2P VOD system.Such as, when certain user when server sends application request broadcast program, server can check at first whether this user has authority to obtain this content, and for example whether the user has bought this service, and this content whether locked (Parental Control).Some advanced features and optimization method in the P2P VOD system have been considered in the document [3], such as safety problem, promptly how to be content-encrypt and distributed key how, also to be included near how can selecting when selecting peer node that service is provided node in addition to optimize the performance that P2P connects.
But scheme in the past and the unresolved problem how reliability services can be provided.In fact, the P2P pattern needs client to participate in providing service, but client belongs to ustomer premises access equipment, service provider be difficult to have absolute control authority (such as, guarantee that it is online always), thereby its stability and reliability that does not have server and had, client may frequently add or withdraw from the P2P system simultaneously, this to system can be stable the service that provides also be a very big challenge, also may there be the restriction on the performance in client in addition, such as disposal ability, upstream bandwidth etc.Therefore for the P2P system, reliability of service is a very big problem, and system is difficult to the assurance that the user provides service quality.This means that traditional P2P system is difficult to directly apply in the middle of the carrier grade service, such as IPTV.From another angle, in carrier grade service, telecom operators have the ability of controlling Internet resources, can utilize these resources (such as server resource) to strengthen the performance of P2P system where necessary, thereby make the P2P system might provide service quality in a way to guarantee.
[1]US?patent?20050055718，“Peer-to-peer?architecture?for?sharing?video?ondemand?contem”；
[2]US?patent?20060107286，“System?and?method?for?the?controlled?on-demanddistribution?of?content?via?a?centralized?server?and?a?peer-to-peer?network”；
[3]US?patent?20070250880，“Peer-to-peer?video?on?demand?techniques”；
Summary of the invention
The present invention by in video on-demand system in conjunction with client-server pattern and P2P pattern, the system that makes both was with good expansibility, and can provide simultaneously certain service quality to guarantee.
Specifically, the storage device of client can come the storage area video content according to the strategy that server is formulated, thereby provides service for other users of request identical content.When client is receiving and during displaying video programs, partial data (such as a few minutes) that can buffer memory is received recently in buffering area, thus might provide service for other users that are close to its broadcast point.
When client order video program, use the P2P pattern to obtain service from other user at first as far as possible, can save the bandwidth consumption and the load of server of backbone network like this, thereby the system that makes is with good expansibility.But, if obtain timely owing to peer node provides the unreliability of service to make the data that are about to play can not rely on the P2P pattern, client can use the client-server pattern directly to obtain the continuity of urgent data to guarantee to play from server end, thereby realizes the assurance on the service quality.The present invention supposes that P2P VOD application deployment is in the network that Differentiated Services (as DiffServ) can be provided, system will be for being applied in the certain bandwidth of distribution on the high priority video flowing code check of program (usually greater than) to promote service quality, client will be considered performance factor when selecting peer node simultaneously, the preferential node of selecting to have enough resources (network bandwidth, disposal ability etc.).
The present invention relates to a kind of terminal installation, it is characterized in that, have: network interface portion, be connected to network, communicate by this network and other-end and the server that carries out data distribution management; Whether data checks portion detects the data that receive in the data block and lacks; And, control part, the other-end information that described control part provides according to server, that data, services can be provided for this terminal, and in the corresponding data information of other-end storage, being defined as this terminal installation provides the other-end device of service, and control described network interface portion with definite other-end device carry out the transmission of required data, when described data checks portion detected data disappearance in the data block that should reproduce in official hour, control part was controlled this network interface portion to described server requests missing data.Simultaneously, this terminal installation also has: parallel download module, realize walking abreast data download to make full use of the available network bandwidth of client from a plurality of terminals, and be responsible for the coordination between the parallel download stream simultaneously; The bandwidth management module, mainly be in charge of this terminal on/distribution of downlink bandwidth resource, between a plurality of connections of parallel download module, adjust downlink bandwidth and distribute; Can when connecting, distribute and the priority adjustment, guarantee bandwidth available bandwidth with server.
The present invention relates to a kind of network system, have a plurality of clients and server, it is characterized in that, described client has: network interface portion, be connected to network, and communicate by this network and other network equipments; Whether data checks portion detects the data that receive in the data block and lacks; And control part, described client terminal device according to provide by server, can provide other client-side informations of data, services and in the corresponding contents information of other client stores for this client, be defined as the client that service is provided of this client, and bring in selected client and to carry out transfer of data.When the data checks portion of the described client in this network detects the data block disappearance that should reproduce in official hour, this client obtains this data block from server, simultaneously, this client terminal device also has: parallel download module, realization to make full use of the available network bandwidth of client, is responsible for the coordination between the parallel download stream from the parallel data download of a plurality of clients simultaneously; The bandwidth management module, mainly be in charge of this terminal on/distribution of downlink bandwidth resource, between a plurality of connections of parallel download module, adjust downlink bandwidth and distribute; Can when connecting, distribute and the priority adjustment, guarantee bandwidth available bandwidth with server.Described server has: the video content stored data base, and this video content stored data base is being stored the initial data of each video frequency program; The client stores content data base is writing down the information of client stores video content; The client terminal playing information database, it is writing down the information of each client current playing program; Network interface portion is connected to network, communicates by this network and other network equipments; And control part, described control part comprises: Content Management/distribution module, the data typing storage device that this Content Management/distribution module can require client to receive and to play according to certain strategy, even the data portion of initiatively client not being asked is deployed in the storage device of client and goes, to optimize the distribution of video data in network; Client terminal playing control module, the information that this client terminal playing control module sends according to client safeguard and upgrade the client terminal playing information database, writes down each just at the playing progress rate of the client of broadcast program; Described server also has: the bandwidth management module, outlet bandwidth resource to server manages, carry out bandwidth detection and distribution to being connected with each of server, simultaneously for the certain bandwidth of the urgency communication reservation of carrying out with server after the loss of data that in official hour, should reproduce with client so that the guarantee of service quality to be provided.
Description of drawings
Fig. 1 is a schematic IPTV system block diagram;
Fig. 2 is the figure of data organizational structure of video program content;
Fig. 3 (A) is the structured flowchart of content server; Fig. 3 (B) is the content servers store structure of data table;
Fig. 4 is the functional block diagram of content server;
Fig. 5 (A) is the structured flowchart of client; Fig. 5 (B) is the client stores structure of data table;
Fig. 6 is the functional block diagram of client;
Fig. 7 is based on the basic messae transitive graph of the content distribution procedure of P2P pattern;
Fig. 8 is the basic messae transitive graph of the process of guaranteeing service quality;
Fig. 9 explains how client-server pattern and reciprocity transmission mode cooperate the schematic diagram to guarantee service quality;
Figure 10 (A) and Figure 10 (B) are the entire flow figure about client;
Figure 11 is the schematic diagram of a plurality of server cooperation scenes;
Figure 12 is the message format that defines among the present invention;
Embodiment
The present invention proposes a kind of based on realizing the method and apparatus that service quality guarantees in the video on-demand system of P2P technology.By utilizing the P2P technology, can come the extensibility of enhanced system by service is provided mutually between the client.Because peer node provides the unreliability of service can not obtain satisfied service quality the time, the client-server pattern will be enabled by system, provide more reliable service by server for the user when the P2P pattern.Compare with traditional technology, the invention has the advantages that the system that makes had both had good extensibility, can provide satisfied service quality for the user again simultaneously.
Figure 1 shows that the IPTV system of a simplification.This system comprises, but is not limited to content server 102, one or more clients 104, network connection 106.
Client 104 generally all has a storage device, client 104 by network connect 106 and content server 102 and other clients communicate.The information (as memory contents, playing progress rate etc.) of each client is grasped and managed to server 102.Each client in this system all agrees according to the certain video content of the requirement of server storage, or receiving and the nearest partial data of buffer memory during displaying video programs, thinks that other users provide service.
When client 104 is online, server 102 can send the program that the command request client receiving it and playing and be stored to storage device, even the content of can initiatively client not asked is pushed to the storage device of client, to improve " backing " distribution in network.Client 104 is periodically announced the situation of its memory contents to server, server end can be distributed with accurate control to video program content in network like this.The content caching that client 104 will receive and play simultaneously in buffering area, thereby can provide service for watching same program and playing progress rate other clients adjacent thereto, server 102 will write down the playing progress rate of each client.When this program of another client-requested, server just can be selected the peer node that service can be provided for it according to playing progress rate and buffer size.
When certain program was play in client 104 requests, server 102 was at first searched those peer node that service can be provided for this client, and these nodes can provide service with the content of buffer memory in content of storing in the storage device or the buffering area.Server 102 sends to client with the tabulation of these nodes, and client can therefrom be chosen the node that top performance can be provided asks service.
Fig. 2 is the figure of data organizational structure of video program content.Video frequency program 202 be split into usually 204, one data blocks of equal-sized plurality of data piece comprise usually some seconds or minute data, be client is stored data in storage device least unit.A data block 204 is made up of the sub-piece 206 of plurality of data, thereby allows client to download same data block from different peer node.A data sub-block is made up of plurality of data bag 206, the least unit when packet 206 is Network Transmission.At the head of data block, comprise the number of the piece sequence number of this data block in program and the data sub-block that is comprised.All data sub-block of same data block all have unified sequence number, and this sequence number is included in the head of data sub-block, and this head also comprises the size of this data sub-block simultaneously, judge whether to receive complete data sub-block to help client.All packets of same data sub-block also all have unified sequence number, and the size of this sequence number and packet is included in the head of packet.
Fig. 3 A is the structured flowchart of content server 102.Content server 102 comprises network interface 30, central processing unit (CPU) 32, hard disk 34, internal memory 36 and bus 38.Fig. 3 B is the content servers store structure of data table.
Fig. 4 is the functional block diagram of content server 102.Control part 360 content management/distribution modules 3600, communication module 3602, client terminal playing control module 3604 and the bandwidth management module 3606 of content server.The video data typing storage device that Content Management/distribution module 3600 can require client to receive and to play according to certain strategy, even the data portion of initiatively client not being asked is deployed in the storage device of client and goes, to optimize the distribution of video data in network, help the P2P system to obtain more performance.Content Management/distribution module 3600 is in charge of maintain customer end memory of content data storehouse 342 simultaneously, when server is received the order request of client, can think that to search the peer node that stores the related-program data this client provides service in search client memory of content data storehouse 342.The program request information that client terminal playing control module 3604 sends according to client is safeguarded and is upgraded client terminal playing information database 346, write down each just at the playing progress rate of the client of broadcast program, when new client is sent order request, just can search and to provide the peer node of service with the content of buffer memory for it like this according to client terminal playing information database 346.Main being responsible for of bandwidth management module 3606 manages the outlet bandwidth resources of server, to being connected distribution and the monitoring of carrying out outlet bandwidth with each of client.Bandwidth management module 3606 will be managed and being connected of client, and for example, when the client that connects in the P2P mode of client can not provide reliability services, client will start to guarantee the continuous broadcast of client with the urgent connection between the server.Bandwidth management module 3606 will be reserved certain bandwidth so that the guarantee of service quality to be provided for being connected with client urgent.
Fig. 5 A is the structured flowchart of client 104, and Fig. 5 B is the client stores structure of data table.Client 104 comprises network interface 40, central processing unit (CPU) 42, hard disk 44, internal memory 46, output equipment 48 and bus 50.In hard disk 44, comprising video content stored data base 440, client stores content data base 442.Video content storage 440 is being stored the partial video data and is being thought that other client provides service.Client stores content data base 442 comprises client stores content-data table 4420, and this table record the information of memory contents on other clients, and this information can obtain from server end.In client stores content-data table 4420, " IP address " refers to the IP address of other clients, and " contents designator " refers to the program that other clients are stored, and " data block " refers to the sequence number of the data block of storing 204.
Fig. 6 is the functional block diagram of client 104.The control part 460 of client comprises content managing module 4600, communication module 4602, parallel download module 4604 and bandwidth management module 4606.Content managing module 4600 is being safeguarded video content stored data base 440, will receive and play according to the requirement of server or be deposited in the video content storage 440 by the data that the server active push is come.Parallel download module 4604 main being responsible for are connected with a plurality of peer node simultaneously with parallel data download, and this mainly is in order to utilize network bandwidth resources fully.Since on the peer node/there is unmatched situation probably in descending available bandwidth, thereby be easy to occur the situation that the client available downstream bandwidth is higher than the upstream bandwidth of peer node, if thereby client only obtains service from a peer node, then its part downlink bandwidth can be wasted.Parallel download module 4604 is responsible for walking abreast data download to make full use of the available downstream bandwidth of client from a plurality of peer node, is responsible for the coordination problem between the parallel download stream simultaneously.And bandwidth management module 4606 mainly be in charge of client on/distribution of downlink bandwidth resource, the particularly constraint of using the high priority downlink bandwidth that distributes for client VOD according to system, how the allocation of downlink bandwidth is to guarantee service quality between a plurality of connections of parallel download module.
Fig. 7 is based on the basic messae transitive graph of the content distribution procedure of P2P pattern.When client 104 (being designated as A in Fig. 7) is wanted request program or jump to another broadcast point in the broadcast program process, it at first sends request for content information message M102 to server 102, its form of message as shown in figure 12, this message indicates program and the initial broadcast point that the user wants program request.Server 102 is responsible for finding the peer node that service can be provided for customer end A, it at first seeks the peer node that stores the target program in search client memory of content data storehouse 342, search client terminal playing information database 346 simultaneously and seek the peer node that broadcast point is contiguous, the enough data in buffer of energy come to provide for customer end A service, whether can provide service to judge according to the buffer size of relation between the broadcast point of A and peer node and peer node.Server can use some peer node optimized choice methods to select those that peer node of better services can be provided.Such as server 102 can preferentially select to be in customer end A the peer node of same subnet, and this can judge by IP address and subnet mask.Select the peer node in the same subnet can reduce the propagation delay time that P2P connects, simultaneously with flow restriction in local subnet.Server 102 sends to customer end A with peer users information on services M104 then, includes node listing and the information of node respective stored content and the information of playing progress rate that service can be provided for A that server is selected among the peer users information on services M104.After receiving peer users information on services M104, customer end A will be selected some nodes and send peer users state detection message M106 to it.After peer node is received message M106, can know current available upstream bandwidth under the high priority by bandwidth management module 4606, thereby judging whether to provide service, can return to customer end A to the state of oneself by peer users state report information M108 then.Whether peer users state report information M108 indicates this peer node can provide service, also comprises simultaneously the state information of oneself, such as bandwidth available under cpu busy percentage, the high priority etc.Customer end A can be picked out the peer node that optimum performance can be provided according to the status report of receiving and remember that to its request service this peer node is B in Fig. 7 as best terminal.Customer end A sends content request message M110 to B and asks service then.Notice that then server can directly provide service for customer end A if discovering server does not have suitable peer node to provide service for customer end A.
Can provide enough performances if P2P connects, that is to say that the P2P connection has enough available bandwidths, peer node is also very stable, and data can be sent to customer end A in time to be used for broadcast, there is no need to employ server resource in this case again.
P2P pattern shown in Fig. 7 can help system obtain good extensibility, but is difficult to guarantee service quality.This is because client 104 belongs to ustomer premises access equipment, is insecure in essence, and server 102 is difficult to it is controlled completely.When customer end A when other clients receive data, these clients might be turned off suddenly by its user, perhaps because the performance that the factor affecting P2P of other services connects, thereby make that service is forced to interrupt.Use buffering area to provide as A under the situation of service in peer node, may be because peer node fast forwarding and fast rewinding or jump to other broadcast point and can't continue to provide service, the unsteadiness of this peer node has very large influence to the performance of P2P system.In the present invention, the client-server pattern will be used for remedying since the influence that causes of client unsteadiness to guarantee the service quality of system.
Fig. 8 is the basic messae transitive graph of the process of guaranteeing service quality.As shown in Figure 8, if customer end A is found to be difficult to obtain data from current peer node B, this may be owing to being that B is switched off suddenly, and perhaps its broadcast point changes, and perhaps variation has taken place the network condition that P2P is connected between A and the B.Notice customer end A can according to peer node B between the flow that is connected of P2P monitor the performance that P2P connects.In this case, A at first seeks other peer node that better services can be provided, such as the C among Fig. 8, then from C request service.But from beginning to seek substitute node to receiving that from substitute node there is certain delay in data, even find C simultaneously, C also exists can not provide service suddenly and needs are sought possibility of service again, so might in time obtain the data of broadcast soon, thereby causes service disruption.In this case, customer end A can directly be asked service to server 102, because server is more more reliable than client.
One of definition so-called " urgent window " among the present invention, as shown in Figure 9, be positioned at the data that the data representation within the urgent window will soon be play, in case find to exist in the urgent window data of disappearance, the performance that then shows P2P can not satisfy the demand that video is play continuously, video playback will be forced to interrupt probably, and then client starts the client-server pattern immediately and obtains remaining data in the current data block from server.As shown in Figure 8, customer end A is by sending directly remaining data in the server requests current data block of content request message M110.The size of " urgent window " was weighed with the time, was traditionally arranged to be N*RTT, and RTT refers to the two-way time that customer end A arrives server 102 here, and N is secure threshold (such as being set to 3 or 4).Bandwidth management module 3606 in the content server 102 will the reserved part bandwidth resources to be used for the urgency communication with client, can in time arrive client to guarantee the data that are about to play.
Bandwidth management module 4606 in the same client 104 will be distributed enough resources to give in the available downstream bandwidth of high priority and urgent connection of server be guaranteed that the data that are about to play can in time arrive client.Bandwidth management module 4606 checks at first whether under high priority downlink bandwidth constraint current available bandwidth satisfies the demand of urgency communication, promptly be higher than the video flowing code check at least, if satisfy the demands, then client 104 bandwidth that urgency communication is required in addition all the residual available bandwidth resource transfer to urgent connection (if the outlet bandwidth of server allows) of server, otherwise client 104 need connect some P2P and be adjusted into low priority even directly close, thereby vacates the required bandwidth of urgent connection for high priority.Client 104 is when the P2P that selects to turn down priority or close connects, and principle is preferentially to select those data downloaded to connect from current broadcast point P2P far away, connects from the nearer P2P of current broadcast point and keep those data downloaded.In case obtained the data in the current data block and do not had the data of disappearance this moment in the urgent window from server, then urgency communication finishes, client 104 is closed and being connected of server, and the bandwidth management module is distributed the available bandwidth high priority under between the P2P connection again again simultaneously.Connect the available bandwidth (because restriction of peer users upstream bandwidth) that can not make full use of under the high priority if find current P2P, client 104 can return to high priority with the P2P connection of being turned down priority, perhaps be connected with the P2P of other peer users, to make full use of the downlink bandwidth resource by parallel download module 4604 increases.
Figure 10 is the entire flow figure about client.When client 104 began request programs or jump to another broadcast point in the broadcast program process, it at first sent request for content information message (1002) to server 102.Server 102 search database, searching can provide the peer node of service for this client with its storage or data in buffer, and server is given client (1004) with the form of peer users information on services with the peer node feedback information that searches out then.After receiving the peer users service information message, client begins the data download by data block.Want the data downloaded piece for the next one, if current peer node can not provide service (not storing corresponding data when serving such as providing with storage rather than buffer memory) (1008), selected again the peer node that service (with buffer memory or storage) can be provided of client with better performance, serve (1010) to its request then, otherwise can continue to serve to the present node request.Client bandwidth management module 4606 will be checked the downlink bandwidth under the high priority whether be fully utilized (1012), if available downlink bandwidth resource is still arranged, client will return to high priority to the P2P connection of being turned down priority in 1030, perhaps be connected with the P2P of other peer users, to make full use of downlink bandwidth resource (1014) by parallel download module 4604 increases.Client 104 will be monitored the performance (1016) that P2P connects, if connecting, P2P can provide satisfied performance, client 104 will continue to obtain data from current peer node, otherwise client will be sought the peer node that better performance can be provided and replaces present node (1018).Whether urgent window ranges contains NO data (1020) in the monitoring that client 104 also continues simultaneously, if do not have, then client will be always with the P2P pattern service of obtaining (1022), until having downloaded current data block (1026), client will be checked and whether download all data (1006) then, if not then return 1008, otherwise whole downloading process finishes.Do not have download to finish if in 1024, find current data block, will return 1016 and continue monitoring performances and download.If but find to have NO data in " urgent window " 1020, client bandwidth management module 4606 will check at first whether under high priority downlink bandwidth constraint current available bandwidth satisfies the demand (1028) of urgency communication, promptly be higher than the video flowing code check at least, if do not satisfy the demands, client 104 needs to select some P2P to connect it is adjusted into low priority even directly closes, thereby vacates and server is set up the urgent required bandwidth (1030) that is connected for high priority.Client 104 is set up promptly to be connected with server and is downloaded remaining data (1032) in the current data block then.Server 102 will transmit this partial data (1034) to client, until having downloaded current data block (1038).Client 104 can check in the current urgent window ranges whether contain NO data (1040) then, if it's not true, then close with urgent connection (1042) of server and return 1006, otherwise will return 1032, continuation utilizes the urgent data of downloading in next data block that are connected with server, to guarantee the service quality of client.
Figure 11 is the schematic diagram of a plurality of server cooperation scenes.In the description in front, what mainly consider is to have only a region server that the scene of service is provided for a Local Area Network.But in fact in large-scale ip TV service arrangement, may there be a plurality of Local Area Networks, all clients in the corresponding server admin Local Area Network be arranged in each Local Area Network and provide service for it.Like this, the P2P connection only occurs in the same area network, that is to say that client only provides service for other clients that are positioned at the same area network, thereby the P2P flow is limited in the Local Area Network naturally, there is not trans-regional P2P flow, saved the outlet bandwidth resource of Local Area Network preciousness.
Figure 12 is the message format that defines among the present invention.
The database storage of above-mentioned execution mode client and server but the invention is not restricted to this in hard disk, also can be stored in other storage mediums.
More than proposed a kind of based on realizing the method and apparatus that service quality guarantees in the video on-demand system of P2P technology.By utilizing the P2P technology, can come the enhanced system performance by service is provided mutually between the client.
Above-mentioned execution mode is to be used to illustrate of the present invention, but scope of the present invention is not limited thereto.The various modifications of implementing in the scope with the identical purpose of claimed range of the present invention are considered to be within the scope of the invention.
Claims (25)
1, a kind of terminal installation is characterized in that, has:
Network interface portion is connected to network, communicates by this network and other-end and the server that carries out data distribution management;
Whether data checks portion detects the reception data and lacks; And,
Control part, the other-end information that described control part provides according to server, that data, services can be provided for this terminal, and in the corresponding data information of other-end storage, being defined as this terminal installation provides the other-end device of service, and control described network interface portion with definite other-end device carry out the transmission of required data.
2, terminal installation as claimed in claim 1 is characterized in that,
The data that described terminal installation transmits are video data.
3, terminal installation as claimed in claim 2 is characterized in that,
Described terminal installation also comprises: video content stored data base, store video content.
4, terminal installation as claimed in claim 3 is characterized in that,
Described terminal installation also has the client stores content data base, that storage provides from server, can provide the other-end information of data, services and in the corresponding data information of other-end storage and buffering for this terminal, send detection information according to this information to these terminals, select best terminal to provide service for this terminal installation by the feedback of these terminals.
5, terminal installation as claimed in claim 4 is characterized in that,
Described best terminal is to be decided by the cpu busy percentage of the terminal of feeding back, available bandwidth.
6, terminal installation as claimed in claim 5 is characterized in that,
Described terminal installation with the process of the described best terminal communication of selecting in, if detect the needs that communication quality can not satisfy this terminal, then, redefine best terminal according to the other-end information of this terminal storage content database stores.
7, terminal installation as claimed in claim 6 is characterized in that,
The content information that described terminal installation regularly will have been stored is notified described server.
8, terminal installation as claimed in claim 7 is characterized in that,
Described terminal installation is when the discontinuous change of broadcast point, and this terminal installation is notified described server by control part with current broadcast point information.
9, terminal installation as claimed in claim 8 is characterized in that,
Described server regularly sends and can upgrade the client stores content data base of this terminal installation for this terminal provides the other-end information of data, services and the corresponding contents information of storing at other-end to described terminal installation.
10, as any described terminal installation of claim 1-9, it is characterized in that,
When described data checks portion detected the data disappearance that should reproduce in official hour, control part was controlled this network interface portion Connection Service device, obtains the data block that comprises desired data from server.
After described terminal installation was obtained the data block that comprises desired data from server, described data checks portion detected when not having the data disappearance in official hour, and this client is closed and being connected of server, and reselected with other clients to be connected.
11, as any described terminal installation of claim 10, it is characterized in that,
Also have: parallel download module, realize walking abreast data download to make full use of the available network bandwidth of client from a plurality of terminals, be responsible for the coordination between the parallel download stream simultaneously;
The bandwidth management module, mainly be in charge of this terminal on/distribution of downlink bandwidth resource, between a plurality of connections of parallel download module, adjust downlink bandwidth and distribute; In the time of can also being used for data disappearance that this terminal should reproduce in official hour, the connection available bandwidth that carries out urgency communication with server is distributed and the priority adjustment, guarantee the urgency communication bandwidth between this terminal and the server.
12, a kind of network system has a plurality of clients and server, it is characterized in that,
Described client has:
Network interface portion is connected to network, communicates by this network and other network equipments;
Whether data checks portion detects the reception data and lacks;
And control part, described client terminal device according to provide by server, can provide other client-side informations of data, services and in the corresponding contents information of other client stores for this client, be defined as the client that service is provided of this client, and bring in selected client and to carry out transfer of data.
13, network system as claimed in claim 12 is characterized in that,
The data that described client transmits are video data.
14, network system as claimed in claim 13 is characterized in that,
Described client also comprises video content stored data base, store video content.
15, network system as claimed in claim 14 is characterized in that,
Described client also comprises the client stores content data base, and is that storage is provided by server, can provide other client-side informations of data, services and in the corresponding contents information of other client stores and buffering for this client,
16, network system as claimed in claim 15 is characterized in that,
Client described in this network according to provide by server, can be that this client terminal device provides other client-side informations of service and in the corresponding data information of other client stores and buffering, send detection information to these clients, select best client to provide service for this client terminal device according to the feedback of these clients.
17, network system as claimed in claim 16 is characterized in that,
Described best client is to decide according to the cpu busy percentage of the client of feeding back, available bandwidth.
18, network system as claimed in claim 17 is characterized in that,
Described client with the process of the described best client communication of selecting in, descend if detect communication performance, then, redefine best client according to other client-side informations of the client stores content database stores of this client.
19, network system as claimed in claim 18 is characterized in that,
The content information that client regularly will have been stored described in this network is notified described server.
20, network system as claimed in claim 19 is characterized in that,
Client described in this network is when the discontinuous change of broadcast point, and described client terminal device is notified described server with current broadcast point information.
21, network system as claimed in claim 20 is characterized in that,
Server described in this network regularly sends and can other client-side informations of data, services is provided and in the corresponding contents information of other client stores, upgrade the client stores content data base of each client for this client to each client.
22, as any described network system of claim 12-21, it is characterized in that,
When the data checks portion of described client detected the loss of data that should reproduce in official hour, control part was controlled this network interface portion Connection Service device, obtains the data block that comprises desired data from server.
After described client obtained the data block that comprises desired data from server, described data checks portion detected when not having the data disappearance in official hour, and this client is closed and being connected of server, and reselected with other clients to be connected.
23, network system as claimed in claim 22 is characterized in that,
Described server has: the video content stored data base, and this video content stored data base is being stored the initial data of each video frequency program; The client stores content data base is writing down the information of client stores video content; The client terminal playing information database, it is writing down the information of each client current playing program.
24, network system as claimed in claim 23 is characterized in that,
Described server also has:
Network interface portion is connected to network, communicates by this network and other network equipments;
And control part, described control part comprises: Content Management/distribution module, the data typing storage device that this Content Management/distribution module can require client to receive and to play according to certain strategy, even the data portion of initiatively client not being asked is deployed in the storage device of client and goes, to optimize the distribution of video data in network;
Client terminal playing control module, the information that this client terminal playing control module sends according to client safeguard and upgrade the client terminal playing information database, writes down each just at the playing progress rate of the client of broadcast program.
25, network system as claimed in claim 24 is characterized in that,
Described server also has the bandwidth management module, outlet bandwidth resource to server manages, carry out bandwidth detection and distribution to being connected with each of server, the certain bandwidth of the urgency communication reservation during simultaneously for the loss of data that should reproduce in official hour with client is to provide the guarantee of service quality.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810137755A CN101631092A (en) | 2008-07-18 | 2008-07-18 | System and method for distributing data |
| JP2009164411A JP2010027053A (en) | 2008-07-18 | 2009-07-13 | Data distribution system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810137755A CN101631092A (en) | 2008-07-18 | 2008-07-18 | System and method for distributing data |
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| Publication Number | Publication Date |
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| CN101631092A true CN101631092A (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810137755A Pending CN101631092A (en) | 2008-07-18 | 2008-07-18 | System and method for distributing data |
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| JP (1) | JP2010027053A (en) |
| CN (1) | CN101631092A (en) |
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